the answer is -$97 for sure. 3 }8 D. M1 Z; g9 F
Think about it this way
/ b: U; |5 K% i0 X0 O! w& h$ _tvb now,tvbnow,bttvb1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
; W; o+ s; l& O6 Y1 d( n2) Now, the owner discovered that the 100 bucks is fake. You can think this as a lost of $100. therefore the overall gain is $3-$100 = -$97 |
發表於 2007-5-16 03:12 AM
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發表於 2007-5-19 03:21 PM
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發表於 2007-5-21 03:49 AM
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